package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.aspectj.apache.bcel.classfile.Code;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService{
    //微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String openid = getOpenid(userLoginDTO.getCode());
        //判断openid是否为空 为空登录失败，抛出异常
        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //不为空，登录成功，根据openid查询用户信息
        User user = userMapper.getByOpenid(openid);
        if(user == null){
             user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        return  user;
    }

    /**
     * 调用微信接口服务获取用户openid
     */
    private String getOpenid(String code){
        Map<String, String> map =  new HashMap<>();
        //设置请求参数
        //设置微信开放平台分配的appid和appsecret
        map.put("appid", weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        //设置临时登录凭证
        map.put("js_code",code);
        //设置授权类型
        map.put("grant_type","authorization_code");
        //发送请求
        String json = HttpClientUtil.doGet(WX_LOGIN,map);
        //解析响应结果
        JSONObject jsonObject = JSON.parseObject(json);
        //获取openid
        String openid = jsonObject.getString ("openid");
        return openid;
    }
}
